745909 has 12 divisors (see below), whose sum is σ = 828900. Its totient is φ = 670208.

The previous prime is 745903. The next prime is 745931. The reversal of 745909 is 909547.

It can be written as a sum of positive squares in 6 ways, for example, as 14884 + 731025 = 122^2 + 855^2 .

It is not a de Polignac number, because 745909 - 2⁹ = 745397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8337 + ... + 8425.

It is an arithmetic number, because the mean of its divisors is an integer number (69075).

2⁷⁴⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

745909 is a deficient number, since it is larger than the sum of its proper divisors (82991).

745909 is a wasteful number, since it uses less digits than its factorization.

745909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 745909 is about 863.6602341199. The cubic root of 745909 is about 90.6905319121.

The spelling of 745909 in words is "seven hundred forty-five thousand, nine hundred nine".